Anime with studious main lead

This may sound weird. haha.
Any anime recommendations with a studious/hardworking main lead?
Im preparing for exams and i guess im lacking the drive.
LOL I probably need such an anime to spur me up! :X
I'd be good if its with humour too.
Something like Kareshi Kanojo no Jijou or Kaichou wa maid-sama
Doesn't have to be shojo.
Any genre is fine (: